"That's the first floor of our house submerged," he wrote in the caption. "Scariest hour or so of my life. Also, sorry for the explicit language."

"Thank you to the fireman that saved us from this nightmare," the kid tweeted. "Happy for us all to be safe, thoughts to others."

Rob, Johnny, and the rest of the Lowe brood are in Europe to celebrate Johnny's graduation from high school. They previously visited the United Kingdom and Spain, but something tells us the France leg will be the most memorable!